They are getting ready for a big reconstruction, I got a request to bid a site survey from an out of town E&A firm and declined.?ÿ
So that's some of the utility markings for the survey.?ÿ
I set one of the two today, with the only manual hammer drill I have ever seen, an odd plastic handled thing with a metal top and a drill bit somehow press fit in the bottom, that one of my mentors passed down years ago before he retired to Arizona. Just as I had a quarter inch to go, the drill bit broke off. So I eyeballed enough lead ribbon to fit the hole and drove the mag nail and washer as hard as I could, and it worked. It will stay for a while. Tomorrow I will go get the Ryobi starter model and start saving for the Bosch.
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My tool guy tells me he has not stocked star drills in 20 years, ever since the first battery powered hammer drills made their debut.
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I was intrigued to know what a star drill bit was, and hand drilling into concrete and stone - found this on the www:
https://www.core77.com/posts/68321/How-to-Hand-Drill-Holes-in-Stone-and-Concrete
That's cool.?ÿ
There is not another tool associated with surveying I hate as hard as I hate the star drill.?ÿ
The day the light came on for me was the day I was driving by a testing crew, they had a little drill off the back of a pickup and were drilling test holes in fresh pavement. I stopped by to watch and asked how much the drill press was. The guy wasn't sure and was renting it from the local rent-it place.
That was it for the star drill. Anytime I needed to drill concrete or pavement I'd stop by the rental shop and pick up a drill and maybe a generator for the day.
The cordless hammer drill has taken over for the core drill and it is a much better hammer than any other one in the tool box, bit over the top, yet try and take it from the crew setting 50 rebar.?ÿ
A star drill is a good way to break some fingers, everyone I know that used one smashed the hand holding the goofy thing.?ÿ
That's a big one; and mechanical.
The star drills I used were hand held drills with a star shaped cutting end and were about 8" long. Hit them with a lump hammer, turn 45, hit again. etc. Each blow broke up a dusting of concrete. Afrer say 10 minutes the hole was deep enough. I used to use a half-inch bit as that meant the little collar on a Hilti nail would go into the hole with some mortar. You then had about an eighth-inch of play in any direction to get to centralised under the tribrach.
I still have a spare at the back of the cupboard.
